What are the troop types and the counter triangle in Dragonfire?

There are 5 troop types: Cavalry, Shieldbearers, Archers, Spearmen and Siege.

The counter triangle (a loop):

• Cavalry beats Shieldbearers
• Shieldbearers beat Archers
• Archers beat Spearmen
• Spearmen beat Cavalry

Siege sits outside it: weak against every troop type, but it deals heavy damage to Durability (a tile's hit points). You never put it on a combat dragon — it's for breaking structures.

The triangle advantage is only worth ±7% (advantage / disadvantage). It's real but small: don't build your army around it unless you know the enemy's type. Build it around research and the +20% affinity.